blocks|key|1293560|text|我应该把这个贴到GitHub上或者别的什么上。这属于NSString类别，使用NSScanner实现，并处理十六进制和十进制数字字符实体以及通常的符号字符实体。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1293561|此外，它可以相对优雅地处理格式错误的字符串(后面跟一个无效的字符序列)，这在使用此代码的released+app中是至关重要的。|1293562|-+(NSString+*)stringByDecodingXMLEntities+{
++++NSUInteger+myLength+=+[self+length];
++++NSUInteger+ampIndex+=+[self+rangeOfString:@"&"+options:NSLiteralSearch].location;

++++//+Short-circuit+if+there+are+no+ampersands.
++++if+(ampIndex+==+NSNotFound)+{
++++++++return+self;
++++}
++++//+Make+result+string+with+some+extra+capacity.
++++NSMutableString+*result+=+[NSMutableString+stringWithCapacity:(myLength+*+1.25)];

++++//+First+iteration+doesn't+need+to+scan+to+&+since+we+did+that+already,+but+for+code+simplicity's+sake+we'll+do+it+again+with+the+scanner.
++++NSScanner+*scanner+=+[NSScanner+scannerWithString:self];
++++do+{
++++++++//+Scan+up+to+the+next+entity+or+the+end+of+the+string.
++++++++NSString+*nonEntityString;
++++++++if+([scanner+scanUpToString:@"&"+intoString:&nonEntityString])+{
++++++++++++[result+appendString:nonEntityString];
++++++++}
++++++++if+([scanner+isAtEnd])+{
++++++++++++goto+finish;
++++++++}
++++++++//+Scan+either+a+HTML+or+numeric+character+entity+reference.
++++++++if+([scanner+scanString:@"&amp;"+intoString:NULL])
++++++++++++[result+appendString:@"&"];
++++++++else+if+([scanner+scanString:@"&apos;"+intoString:NULL])
++++++++++++[result+appendString:@"'"];
++++++++else+if+([scanner+scanString:@"&quot;"+intoString:NULL])
++++++++++++[result+appendString:@"\""];
++++++++else+if+([scanner+scanString:@"&lt;"+intoString:NULL])
++++++++++++[result+appendString:@"<"];
++++++++else+if+([scanner+scanString:@"&gt;"+intoString:NULL])
++++++++++++[result+appendString:@">"];
++++++++else+if+([scanner+scanString:@"&#"+intoString:NULL])+{
++++++++++++BOOL+gotNumber;
++++++++++++unsigned+charCode;
++++++++++++NSString+*xForHex+=+@"";

++++++++++++//+Is+it+hex+or+decimal?
++++++++++++if+([scanner+scanString:@"x"+intoString:&xForHex])+{
++++++++++++++++gotNumber+=+[scanner+scanHexInt:&charCode];
++++++++++++}
++++++++++++else+{
++++++++++++++++gotNumber+=+[scanner+scanInt:(int*)&charCode];
++++++++++++}
++++++++++++if+(gotNumber)+{
++++++++++++++++[result+appendFormat:@"%25C",+charCode];
++++++++++++}
++++++++++++else+{
++++++++++++++++NSString+*unknownEntity+=+@"";
++++++++++++++++[scanner+scanUpToString:@";"+intoString:&unknownEntity];
++++++++++++++++[result+appendFormat:@"&#%25@%25@;",+xForHex,+unknownEntity];
++++++++++++++++NSLog(@"Expected+numeric+character+entity+but+got+&#%25@%25@;",+xForHex,+unknownEntity);
++++++++++++}
++++++++++++[scanner+scanString:@";"+intoString:NULL];
++++++++}
++++++++else+{
++++++++++++NSString+*unknownEntity+=+@"";
++++++++++++[scanner+scanUpToString:@";"+intoString:&unknownEntity];
++++++++++++NSString+*semicolon+=+@"";
++++++++++++[scanner+scanString:@";"+intoString:&semicolon];
++++++++++++[result+appendFormat:@"%25@%25@",+unknownEntity,+semicolon];
++++++++++++NSLog(@"Unsupported+XML+character+entity+%25@%25@",+unknownEntity,+semicolon);
++++++++}
++++}
++++while+(![scanner+isAtEnd]);

finish:
++++return+result;
}|code-block|syntax|javascript|1293563|entityMap|0|LINK|mutability|MUTABLE|url|http://danieldickison.com/etsyaddict/^0|13|9|0|18|C|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

I ought to post this on GitHub or something. This goes in a category of NSString, uses <code>NSScanner</code> for the implementation, and handles both hex and decimal numeric character entities as well as the usual symbolic ones.

Also, it handles malformed strings (when you have an &amp; followed by an invalid sequence of characters) relatively gracefully, which turned out to be crucial in my <a href="http://danieldickison.com/etsyaddict/" rel="noreferrer">released app</a> that uses this code.

<pre><code>- (NSString *)stringByDecodingXMLEntities {
 NSUInteger myLength = [self length];
 NSUInteger ampIndex = [self rangeOfString:@"&amp;" options:NSLiteralSearch].location;

 // Short-circuit if there are no ampersands.
 if (ampIndex == NSNotFound) {
 return self;
 }
 // Make result string with some extra capacity.
 NSMutableString *result = [NSMutableString stringWithCapacity:(myLength * 1.25)];

 // First iteration doesn't need to scan to &amp; since we did that already, but for code simplicity's sake we'll do it again with the scanner.
 NSScanner *scanner = [NSScanner scannerWithString:self];
 do {
 // Scan up to the next entity or the end of the string.
 NSString *nonEntityString;
 if ([scanner scanUpToString:@"&amp;" intoString:&amp;nonEntityString]) {
 [result appendString:nonEntityString];
 }
 if ([scanner isAtEnd]) {
 goto finish;
 }
 // Scan either a HTML or numeric character entity reference.
 if ([scanner scanString:@"&amp;amp;" intoString:NULL])
 [result appendString:@"&amp;"];
 else if ([scanner scanString:@"&amp;apos;" intoString:NULL])
 [result appendString:@"'"];
 else if ([scanner scanString:@"&amp;quot;" intoString:NULL])
 [result appendString:@"\""];
 else if ([scanner scanString:@"&amp;lt;" intoString:NULL])
 [result appendString:@"&lt;"];
 else if ([scanner scanString:@"&amp;gt;" intoString:NULL])
 [result appendString:@"&gt;"];
 else if ([scanner scanString:@"&amp;#" intoString:NULL]) {
 BOOL gotNumber;
 unsigned charCode;
 NSString *xForHex = @"";

 // Is it hex or decimal?
 if ([scanner scanString:@"x" intoString:&amp;xForHex]) {
 gotNumber = [scanner scanHexInt:&amp;charCode];
 }
 else {
 gotNumber = [scanner scanInt:(int*)&amp;charCode];
 }
 if (gotNumber) {
 [result appendFormat:@"%C", charCode];
 }
 else {
 NSString *unknownEntity = @"";
 [scanner scanUpToString:@";" intoString:&amp;unknownEntity];
 [result appendFormat:@"&amp;#%@%@;", xForHex, unknownEntity];
 NSLog(@"Expected numeric character entity but got &amp;#%@%@;", xForHex, unknownEntity);
 }
 [scanner scanString:@";" intoString:NULL];
 }
 else {
 NSString *unknownEntity = @"";
 [scanner scanUpToString:@";" intoString:&amp;unknownEntity];
 NSString *semicolon = @"";
 [scanner scanString:@";" intoString:&amp;semicolon];
 [result appendFormat:@"%@%@", unknownEntity, semicolon];
 NSLog(@"Unsupported XML character entity %@%@", unknownEntity, semicolon);
 }
 }
 while (![scanner isAtEnd]);

finish:
 return result;
}
</code></pre>

blocks|key|1508271|text|这是我使用RegexKitLite框架实现的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1508272|-(NSString*)+decodeHtmlUnicodeCharacters:+(NSString*)+html+{
NSString*+result+=+[html+copy];
NSArray*+matches+=+[result+arrayOfCaptureComponentsMatchedByRegex:+@"\\&#([\\d]%2B);"];

if+(![matches+count])+
++++return+result;

for+(int+i=0;+i<[matches+count];+i%2B%2B)+{
++++NSArray*+array+=+[matches+objectAtIndex:+i];
++++NSString*+charCode+=+[array+objectAtIndex:+1];
++++int+code+=+[charCode+intValue];
++++NSString*+character+=+[NSString+stringWithFormat:@"%25C",+code];
++++result+=+[result+stringByReplacingOccurrencesOfString:+[array+objectAtIndex:+0]
+++++++++++++++++++++++++++++++++++++++++++++++withString:+character];++++++
}+++
return+result;++|code-block|syntax|javascript|1508273|}|1508274|希望这能帮助到一些人。|1508275|entityMap|0|LINK|mutability|MUTABLE|url|http://regexkit.sourceforge.net/RegexKitLite/^0|5|C|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

This is the way I do it using <a href="http://regexkit.sourceforge.net/RegexKitLite/" rel="nofollow noreferrer">RegexKitLite</a> framework:

<pre><code>-(NSString*) decodeHtmlUnicodeCharacters: (NSString*) html {
NSString* result = [html copy];
NSArray* matches = [result arrayOfCaptureComponentsMatchedByRegex: @"\\&amp;#([\\d]+);"];

if (![matches count]) 
 return result;

for (int i=0; i&lt;[matches count]; i++) {
 NSArray* array = [matches objectAtIndex: i];
 NSString* charCode = [array objectAtIndex: 1];
 int code = [charCode intValue];
 NSString* character = [NSString stringWithFormat:@"%C", code];
 result = [result stringByReplacingOccurrencesOfString: [array objectAtIndex: 0]
 withString: character]; 
} 
return result; 
</code></pre>

}

Hope this will help someone.

blocks|key|1293714|text|你可以使用这个函数来解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293715|%2B+(NSString*)+decodeHtmlUnicodeCharactersToString:(NSString*)str
{
++++NSMutableString*+string+=+[[NSMutableString+alloc]+initWithString:str];++//+#&39;+replace+with+'
++++NSString*+unicodeStr+=+nil;
++++NSString*+replaceStr+=+nil;
++++int+counter+=+-1;

++++for(int+i+=+0;+i+<+[string+length];+%2B%2Bi)
++++{
++++++++unichar+char1+=+[string+characterAtIndex:i];++++
++++++++for+(int+k+=+i+%2B+1;+k+<+[string+length]+-+1;+%2B%2Bk)
++++++++{
++++++++++++unichar+char2+=+[string+characterAtIndex:k];++++

++++++++++++if+(char1+==+'&'++&&+char2+==+'#'+)+
++++++++++++{+++
++++++++++++++++%2B%2Bcounter;
++++++++++++++++unicodeStr+=+[string+substringWithRange:NSMakeRange(i+%2B+2+,+2)];++++
++++++++++++++++//+read+integer+value+i.e,+39
++++++++++++++++replaceStr+=+[string+substringWithRange:NSMakeRange+(i,+5)];+++++//+++++#&39;
++++++++++++++++[string+replaceCharactersInRange:+[string+rangeOfString:replaceStr]+withString:[NSString+stringWithFormat:@"%25c",[unicodeStr+intValue]]];
++++++++++++++++break;
++++++++++++}
++++++++}
++++}
++++[string+autorelease];

++++if+(counter+>+1)
++++++++return++[self+decodeHtmlUnicodeCharactersToString:string];+
++++else
++++++++return+string;
}|code-block|syntax|javascript|1293716|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can use just this function to solve this problem.

<pre><code>+ (NSString*) decodeHtmlUnicodeCharactersToString:(NSString*)str
{
 NSMutableString* string = [[NSMutableString alloc] initWithString:str]; // #&amp;39; replace with '
 NSString* unicodeStr = nil;
 NSString* replaceStr = nil;
 int counter = -1;

 for(int i = 0; i &lt; [string length]; ++i)
 {
 unichar char1 = [string characterAtIndex:i]; 
 for (int k = i + 1; k &lt; [string length] - 1; ++k)
 {
 unichar char2 = [string characterAtIndex:k]; 

 if (char1 == '&amp;' &amp;&amp; char2 == '#' ) 
 { 
 ++counter;
 unicodeStr = [string substringWithRange:NSMakeRange(i + 2 , 2)]; 
 // read integer value i.e, 39
 replaceStr = [string substringWithRange:NSMakeRange (i, 5)]; // #&amp;39;
 [string replaceCharactersInRange: [string rangeOfString:replaceStr] withString:[NSString stringWithFormat:@"%c",[unicodeStr intValue]]];
 break;
 }
 }
 }
 [string autorelease];

 if (counter &gt; 1)
 return [self decodeHtmlUnicodeCharactersToString:string]; 
 else
 return string;
}
</code></pre>

blocks|key|1293724|text|看看我的NSString+category+for+HTML吧。以下是可用的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1293725|-+(NSString+*)stringByConvertingHTMLToPlainText;
-+(NSString+*)stringByDecodingHTMLEntities;
-+(NSString+*)stringByEncodingHTMLEntities;
-+(NSString+*)stringWithNewLinesAsBRs;
-+(NSString+*)stringByRemovingNewLinesAndWhitespace;|code-block|syntax|javascript|1293726|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/mwaterfall/MWFeedParser/blob/master/Classes/NSString%2BHTML.m^0|4|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Check out my <a href="http://github.com/mwaterfall/MWFeedParser/blob/master/Classes/NSString+HTML.m" rel="noreferrer">NSString category for HTML</a>. Here are the methods available:

<pre><code>- (NSString *)stringByConvertingHTMLToPlainText;
- (NSString *)stringByDecodingHTMLEntities;
- (NSString *)stringByEncodingHTMLEntities;
- (NSString *)stringWithNewLinesAsBRs;
- (NSString *)stringByRemovingNewLinesAndWhitespace;
</code></pre>

blocks|key|1508459|text|似乎没有人提到最简单的选项之一：Google+Toolbox+for+Mac|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1508460|(尽管名称如此，但它也适用于iOS。)|1508461|https://github.com/google/google-toolbox-for-mac/blob/master/Foundation/GTMNSString%252BHTML.h|1508462|///+Get+a+string+where+internal+characters+that+are+escaped+for+HTML+are+unescaped+
//
///++For+example,+'&amp;'+becomes+'&'
///++Handles+&#32;+and+&#x32;+cases+as+well
///
//++Returns:
//++++Autoreleased+NSString
//
-+(NSString+*)gtm_stringByUnescapingFromHTML;|code-block|syntax|javascript|1508463|我只需要在项目中包含三个文件:+header、implementation和GTMDefines.h。|style|CODE|1508464|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/google/google-toolbox-for-mac/|1|https://github.com/google/google-toolbox-for-mac/blob/master/Foundation/GTMNSString%252BHTML.h^0|G|M|0|0|0|0|2K|1|0|0|12|C|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|H|3|I|5|J|7|19|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1A|8|@$A|1B|B|1C|O|P]]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

Nobody seems to mention one of the simplest options: <a href="https://github.com/google/google-toolbox-for-mac/" rel="nofollow noreferrer">Google Toolbox for Mac</a> 
(Despite the name, this works on iOS too.)

<a href="https://github.com/google/google-toolbox-for-mac/blob/master/Foundation/GTMNSString%2BHTML.h" rel="nofollow noreferrer">https://github.com/google/google-toolbox-for-mac/blob/master/Foundation/GTMNSString%2BHTML.h</a>

<pre><code>/// Get a string where internal characters that are escaped for HTML are unescaped 
//
/// For example, '&amp;amp;' becomes '&amp;'
/// Handles &amp;#32; and &amp;#x32; cases as well
///
// Returns:
// Autoreleased NSString
//
- (NSString *)gtm_stringByUnescapingFromHTML;
</code></pre>

And I had to include only three files in the project: header, implementation and <code>GTMDefines.h</code>.

blocks|key|1293842|text|好像你需要另一个解决方案！这是一个非常简单和有效的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293843|@interface+NSString+(NSStringCategory)
-+(NSString+*)+stringByReplacingISO8859Codes;
@end


@implementation+NSString+(NSStringCategory)
-+(NSString+*)+stringByReplacingISO8859Codes
{
++++NSString+*dataString+=+self;
++++do+{
++++++++//***+See+if+string+contains+&#+prefix
++++++++NSRange+range+=+[dataString+rangeOfString:+@"&#"+options:+NSRegularExpressionSearch];
++++++++if+(range.location+==+NSNotFound)+{
++++++++++++break;
++++++++}
++++++++//***+Get+the+next+three+charaters+after+the+prefix
++++++++NSString+*isoHex+=+[dataString+substringWithRange:+NSMakeRange(range.location+%2B+2,+3)];
++++++++//***+Create+the+full+code+for+replacement
++++++++NSString+*isoString+=+[NSString+stringWithFormat:+@"&#%25@;",+isoHex];
++++++++//***+Convert+to+decimal+integer
++++++++unsigned+decimal+=+0;
++++++++NSScanner+*scanner+=+[NSScanner+scannerWithString:+[NSString+stringWithFormat:+@"0%25@",+isoHex]];
++++++++[scanner+scanHexInt:+&decimal];
++++++++//***+Use+decimal+code+to+get+unicode+character
++++++++NSString+*unicode+=+[NSString+stringWithFormat:@"%25C",+decimal];
++++++++//***+Replace+all+occurences+of+this+code+in+the+string
++++++++dataString+=+[dataString+stringByReplacingOccurrencesOfString:+isoString+withString:+unicode];
++++}+while+(TRUE);+//***+Loop+until+we+hit+the+NSNotFound

++++return+dataString;
}
@end|code-block|syntax|javascript|1293844|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

As if you need another solution! This one is pretty simple and quite effective:

<pre><code>@interface NSString (NSStringCategory)
- (NSString *) stringByReplacingISO8859Codes;
@end


@implementation NSString (NSStringCategory)
- (NSString *) stringByReplacingISO8859Codes
{
 NSString *dataString = self;
 do {
 //*** See if string contains &amp;# prefix
 NSRange range = [dataString rangeOfString: @"&amp;#" options: NSRegularExpressionSearch];
 if (range.location == NSNotFound) {
 break;
 }
 //*** Get the next three charaters after the prefix
 NSString *isoHex = [dataString substringWithRange: NSMakeRange(range.location + 2, 3)];
 //*** Create the full code for replacement
 NSString *isoString = [NSString stringWithFormat: @"&amp;#%@;", isoHex];
 //*** Convert to decimal integer
 unsigned decimal = 0;
 NSScanner *scanner = [NSScanner scannerWithString: [NSString stringWithFormat: @"0%@", isoHex]];
 [scanner scanHexInt: &amp;decimal];
 //*** Use decimal code to get unicode character
 NSString *unicode = [NSString stringWithFormat:@"%C", decimal];
 //*** Replace all occurences of this code in the string
 dataString = [dataString stringByReplacingOccurrencesOfString: isoString withString: unicode];
 } while (TRUE); //*** Loop until we hit the NSNotFound

 return dataString;
}
@end
</code></pre>

blocks|key|1293892|text|实际上，迈克尔·瀑布的伟大MWFeedParser框架(参考他的答案)已经由rmchaara创建，他已经使用ARC支持对其进行了更新！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293893|你可以在Github+here中找到它|offset|length|1293894|它真的工作得很好，我使用了stringByDecodingHTMLEntities方法，而且工作得很完美。|1293895|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/rmchaara/MWFeedParser/blob/master/Classes/MWFeedParser.h^0|0|B|4|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Actually the great MWFeedParser framework of Michael Waterfall (referred to his answer) has been forked by rmchaara who has update it with ARC support!

You can find it in Github <a href="https://github.com/rmchaara/MWFeedParser/blob/master/Classes/MWFeedParser.h" rel="nofollow" title="here">here</a>

It really works great, I used stringByDecodingHTMLEntities method and works flawlessly.

blocks|key|1508604|text|这是Walty+Yeung's+answer的一个快速版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1508605|extension+String+{
++++static+private+let+mappings+=+["&quot;"+:+"\"","&amp;"+:+"&",+"&lt;"+:+"<",+"&gt;"+:+">","&nbsp;"+:+"+","&iexcl;"+:+"¡","&cent;"+:+"¢","&pound;"+:+"+£","&curren;"+:+"¤","&yen;"+:+"¥","&brvbar;"+:+"¦","&sect;"+:+"§","&uml;"+:+"¨","&copy;"+:+"©","&ordf;"+:+"+ª","&laquo"+:+"«","&not"+:+"¬","&reg"+:+"®","&macr"+:+"¯","&deg"+:+"°","&plusmn"+:+"±","&sup2;+"+:+"²","&sup3"+:+"³","&acute"+:+"´","&micro"+:+"µ","&para"+:+"¶","&middot"+:+"·","&cedil"+:+"¸","&sup1"+:+"¹","&ordm"+:+"º","&raquo"+:+"»&","frac14"+:+"¼","&frac12"+:+"½","&frac34"+:+"¾","&iquest"+:+"¿","&times"+:+"×","&divide"+:+"÷","&ETH"+:+"Ð","&eth"+:+"ð","&THORN"+:+"Þ","&thorn"+:+"þ","&AElig"+:+"Æ","&aelig"+:+"æ","&OElig"+:+"Œ","&oelig"+:+"œ","&Aring"+:+"Å","&Oslash"+:+"Ø","&Ccedil"+:+"Ç","&ccedil"+:+"ç","&szlig"+:+"ß","&Ntilde;"+:+"Ñ","&ntilde;":"ñ",]

++++func+stringByDecodingXMLEntities()+->+String+{

++++++++guard+let+_+=+self.rangeOfString("&",+options:+[.LiteralSearch])+else+{
++++++++++++return+self
++++++++}

++++++++var+result+=+""

++++++++let+scanner+=+NSScanner(string:+self)
++++++++scanner.charactersToBeSkipped+=+nil

++++++++let+boundaryCharacterSet+=+NSCharacterSet(charactersInString:+"+\t\n\r;")

++++++++repeat+{
++++++++++++var+nonEntityString:+NSString?+=+nil

++++++++++++if+scanner.scanUpToString("&",+intoString:+&nonEntityString)+{
++++++++++++++++if+let+s+=+nonEntityString+as?+String+{
++++++++++++++++++++result.appendContentsOf(s)
++++++++++++++++}
++++++++++++}

++++++++++++if+scanner.atEnd+{
++++++++++++++++break
++++++++++++}

++++++++++++var+didBreak+=+false
++++++++++++for+(k,v)+in+String.mappings+{
++++++++++++++++if+scanner.scanString(k,+intoString:+nil)+{
++++++++++++++++++++result.appendContentsOf(v)
++++++++++++++++++++didBreak+=+true
++++++++++++++++++++break
++++++++++++++++}
++++++++++++}

++++++++++++if+!didBreak+{

++++++++++++++++if+scanner.scanString("&#",+intoString:+nil)+{

++++++++++++++++++++var+gotNumber+=+false
++++++++++++++++++++var+charCodeUInt:+UInt32+=+0
++++++++++++++++++++var+charCodeInt:+Int32+=+-1
++++++++++++++++++++var+xForHex:+NSString?+=+nil

++++++++++++++++++++if+scanner.scanString("x",+intoString:+&xForHex)+{
++++++++++++++++++++++++gotNumber+=+scanner.scanHexInt(&charCodeUInt)
++++++++++++++++++++}
++++++++++++++++++++else+{
++++++++++++++++++++++++gotNumber+=+scanner.scanInt(&charCodeInt)
++++++++++++++++++++}

++++++++++++++++++++if+gotNumber+{
++++++++++++++++++++++++let+newChar+=+String(format:+"%25C",+(charCodeInt+>+-1)+?+charCodeInt+:+charCodeUInt)
++++++++++++++++++++++++result.appendContentsOf(newChar)
++++++++++++++++++++++++scanner.scanString(";",+intoString:+nil)
++++++++++++++++++++}
++++++++++++++++++++else+{
++++++++++++++++++++++++var+unknownEntity:+NSString?+=+nil
++++++++++++++++++++++++scanner.scanUpToCharactersFromSet(boundaryCharacterSet,+intoString:+&unknownEntity)
++++++++++++++++++++++++let+h+=+xForHex+??+""
++++++++++++++++++++++++let+u+=+unknownEntity+??+""
++++++++++++++++++++++++result.appendContentsOf("&#\(h)\(u)")
++++++++++++++++++++}
++++++++++++++++}
++++++++++++++++else+{
++++++++++++++++++++scanner.scanString("&",+intoString:+nil)
++++++++++++++++++++result.appendContentsOf("&")
++++++++++++++++}
++++++++++++}

++++++++}+while+(!scanner.atEnd)

++++++++return+result
++++}
}|code-block|syntax|javascript|1508606|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/1453142/1153630^0|2|K|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Here's a Swift version of <a href="https://stackoverflow.com/a/1453142/1153630">Walty Yeung's answer</a>: 

<pre><code>extension String {
 static private let mappings = ["&amp;quot;" : "\"","&amp;amp;" : "&amp;", "&amp;lt;" : "&lt;", "&amp;gt;" : "&gt;","&amp;nbsp;" : " ","&amp;iexcl;" : "¡","&amp;cent;" : "¢","&amp;pound;" : " £","&amp;curren;" : "¤","&amp;yen;" : "¥","&amp;brvbar;" : "¦","&amp;sect;" : "§","&amp;uml;" : "¨","&amp;copy;" : "©","&amp;ordf;" : " ª","&amp;laquo" : "«","&amp;not" : "¬","&amp;reg" : "®","&amp;macr" : "¯","&amp;deg" : "°","&amp;plusmn" : "±","&amp;sup2; " : "²","&amp;sup3" : "³","&amp;acute" : "´","&amp;micro" : "µ","&amp;para" : "¶","&amp;middot" : "·","&amp;cedil" : "¸","&amp;sup1" : "¹","&amp;ordm" : "º","&amp;raquo" : "»&amp;","frac14" : "¼","&amp;frac12" : "½","&amp;frac34" : "¾","&amp;iquest" : "¿","&amp;times" : "×","&amp;divide" : "÷","&amp;ETH" : "Ð","&amp;eth" : "ð","&amp;THORN" : "Þ","&amp;thorn" : "þ","&amp;AElig" : "Æ","&amp;aelig" : "æ","&amp;OElig" : "Œ","&amp;oelig" : "œ","&amp;Aring" : "Å","&amp;Oslash" : "Ø","&amp;Ccedil" : "Ç","&amp;ccedil" : "ç","&amp;szlig" : "ß","&amp;Ntilde;" : "Ñ","&amp;ntilde;":"ñ",]

 func stringByDecodingXMLEntities() -&gt; String {

 guard let _ = self.rangeOfString("&amp;", options: [.LiteralSearch]) else {
 return self
 }

 var result = ""

 let scanner = NSScanner(string: self)
 scanner.charactersToBeSkipped = nil

 let boundaryCharacterSet = NSCharacterSet(charactersInString: " \t\n\r;")

 repeat {
 var nonEntityString: NSString? = nil

 if scanner.scanUpToString("&amp;", intoString: &amp;nonEntityString) {
 if let s = nonEntityString as? String {
 result.appendContentsOf(s)
 }
 }

 if scanner.atEnd {
 break
 }

 var didBreak = false
 for (k,v) in String.mappings {
 if scanner.scanString(k, intoString: nil) {
 result.appendContentsOf(v)
 didBreak = true
 break
 }
 }

 if !didBreak {

 if scanner.scanString("&amp;#", intoString: nil) {

 var gotNumber = false
 var charCodeUInt: UInt32 = 0
 var charCodeInt: Int32 = -1
 var xForHex: NSString? = nil

 if scanner.scanString("x", intoString: &amp;xForHex) {
 gotNumber = scanner.scanHexInt(&amp;charCodeUInt)
 }
 else {
 gotNumber = scanner.scanInt(&amp;charCodeInt)
 }

 if gotNumber {
 let newChar = String(format: "%C", (charCodeInt &gt; -1) ? charCodeInt : charCodeUInt)
 result.appendContentsOf(newChar)
 scanner.scanString(";", intoString: nil)
 }
 else {
 var unknownEntity: NSString? = nil
 scanner.scanUpToCharactersFromSet(boundaryCharacterSet, intoString: &amp;unknownEntity)
 let h = xForHex ?? ""
 let u = unknownEntity ?? ""
 result.appendContentsOf("&amp;#\(h)\(u)")
 }
 }
 else {
 scanner.scanString("&amp;", intoString: nil)
 result.appendContentsOf("&amp;")
 }
 }

 } while (!scanner.atEnd)

 return result
 }
}
</code></pre>

blocks|key|1293999|text|如果有字符串形式的字符实体引用，例如@"2318"，则可以使用strtoul提取具有正确unicode字符的重新编码的NSString；|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1294000|NSString+*unicodePoint+=+@"2318"
unichar+iconChar+=+(unichar)+strtoul(unicodePoint.UTF8String,+NULL,+16);
NSString+*recoded+=+[NSString+stringWithFormat:@"%25C",+iconChar];
NSLog(@"recoded:+%25@",+recoded");
//+prints+out+"recoded:+⌘"|code-block|syntax|javascript|1294001|entityMap^0|I|7|V|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

If you have the Character Entity Reference as a string, e.g. <code>@"2318"</code>, you can extract a recoded NSString with the correct unicode character using <code>strtoul</code>;

<pre><code>NSString *unicodePoint = @"2318"
unichar iconChar = (unichar) strtoul(unicodePoint.UTF8String, NULL, 16);
NSString *recoded = [NSString stringWithFormat:@"%C", iconChar];
NSLog(@"recoded: %@", recoded");
// prints out "recoded: ⌘"
</code></pre>

First of all, I found this: <a href="https://stackoverflow.com/questions/659602/objective-c-html-escape-unescape"><a href="https://stackoverflow.com/questions/659602/objective-c-html-escape-unescape">Objective C HTML escape/unescape</a></a>, but it doesn't work for me.

My encoded characters (come from a RSS feed, btw) look like this: <code>&amp;#038;</code>

I searched all over the net and found related discussions, but no fix for my particular encoding, I think they are called hexadecimal characters.

HTML character decoding in Objective-C / Cocoa Touch

GitHub

首先，我发现了这个：，但它不适用于我。我的编码字符(来自RSS feed，btw)如下所示：&#038;我在网上到处搜索，找到了相关的讨论，但没有修复我的特定编码，我认为它们被称为十六进制字符。

问Objective-C / Cocoa Touch中的HTML字符解码
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Objective-C / Cocoa Touch中的HTML字符解码EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Objective-C / Cocoa Touch中的HTML字符解码
EN